NOVEL METHACRYLIC RESIN EXTRUSION PLATE AND MANUFACTURING METHOD THEREOF

摘要

Extrusion molding is performed by using a methacrylic resin extrusion plate having a plate thickness of 2.0 to 15.0 mm and formed by a mixture having an apparent density of 0.80 g/ml or above prepared by mixing spherical methacrylic resin polymer having an apparent density of 0.70 g/ml to 0.78 g/ml and cylindrical methacrylic resin polymer having an apparent density of 0.63 g/ml to 0.70 g/ml and/or flat methacrylic resin polymer having an apparent density of 0.63 g/ml to 0.70 g/ml. The brightness uniformity is controlled to be 80% or above and the plate thickness accuracy in the width direction is controlled to be within ±1.0% of the average plate thickness. There is provided a methacrylic resin extrusion plate for a light guide plate which can be preferably used for office automation devices such as a personal computer and a word processor, display devices used for various monitors displaying an image signal such as a panel monitor and a television monitor, display devices used for indoor or outdoor illumination devices and sign boards.